Hello Serghei,
Well, yes, the sky is rather grainy, but as I tell myself when I watch my own scans: The composition is more important than technical perfection. That goes for this one too. It's a superbly catchy and amusing photo.
Kind regards,
Gert

Hi Serghei
I like the very random design here too, it gives a sense of whimsy to the image, although I doubt that is how the man on the parachute feel! Very light hearted image that makes me smile. Nice one!
Cheers
Noel

Hi Serghei,
Smoke really does good effect on this shot and it also gives idea of the path this skydiver has made. Dynami and colourful shot.
The sky indeed looks grainy. I don't think 7D makes so much noise even on ISO800. It looks sharpened and maybe also overcompressed. You should avoid sharpening even colour areas like sky.
Kari

Haha, this is a fun one for sure! Another unexpected and happy surprise from your trip. :) I love the non-patterned smoke trail from this sky diver, you've composed this most effectively with the abundance of negative space. In fact, it serves quite well in this instance, which allows us to focus on the "tiny" man falling from the sky. Of course, there's a lot of blue color, which will always catch my attention as well. :) This is something I've always wanted to try, but have never actually worked up enough courage...so I'll admire this viewpoint instead. lol Hope you had a nice dirty bus ride up North, can't wait to see some pictures from the City by the Bay. Have fun buddy. Talk again soon.